Changes to Create a relation

added the new known_of_not_writable enum value to the error/code response property for the response status 400

added the new known_of_not_writable enum value to the error/code response property for the response status 401

added the new known_of_not_writable enum value to the error/code response property for the response status 403

added the new known_of_not_writable enum value to the error/code response property for the response status 409

added the new known_of_not_writable enum value to the error/code response property for the response status 422

added the new known_of_not_writable enum value to the error/code response property for the response status 429

added the new known_of_not_writable enum value to the error/code response property for the response status 503

added the new character_taken enum value to the error/code response property for the response status 400

added the new character_taken enum value to the error/code response property for the response status 401

added the new character_taken enum value to the error/code response property for the response status 403

added the new character_taken enum value to the error/code response property for the response status 409

added the new character_taken enum value to the error/code response property for the response status 422

added the new character_taken enum value to the error/code response property for the response status 429

added the new character_taken enum value to the error/code response property for the response status 503

added the new world_full enum value to the error/code response property for the response status 400

added the new world_full enum value to the error/code response property for the response status 401

added the new world_full enum value to the error/code response property for the response status 403

added the new world_full enum value to the error/code response property for the response status 409

added the new world_full enum value to the error/code response property for the response status 422

added the new world_full enum value to the error/code response property for the response status 429

added the new world_full enum value to the error/code response property for the response status 503

added the optional property known_of to the response with the 201 status